Control apparatus for a strip winding device



June 20, 1961 W. D. KING CONTROL APPARATUS FOR A STRIP WINDING DEVICEFiled Aug. 30, 1957 2 Sheets-Sheet 1 Reg uloted D C volt oge Source A.CVoltage pp y Fig.l. wmvsssss: INVENTOR 6S William D. King M 9 2 ATTORNEYW. D. KING June 20, 1961 CONTROL APPARATUS FOR A STRIP WINDING DEVICEFiled Aug. 30, 1957 2 Sheets-Sheet 2 II. I Ill '14 5 0 5 0 4 3 4 6 7 n 7o 2 llLlllllll Illllll 5 0 w 7 5 Coil Oufside Diometer- Inches Fig.2.

AC Voltage pp y Fig.3.

United States Patent 2,989,264 CON I'R 0L APPARATUSVII OR A SIRIPWINDING DE CE William D. King, East Aurora, N.Y., assignor toWestinghouse Electric Corporation, East Pittsburgh, Pa., a corporationof Pennsylvania Filed Aug. 30, 1957, Ser. No. 681,248 8 Claims. (Cl.24275.51)

The present invention relates, in general, to control apparatus for astrip winding or coiling device, and more particularly to controlapparatus for controlling the tension of a strip relative to a stripwinding device in a predetermined manner relative to the build-up oreffective diameter of the strip on the winding device.

It is an object of the present invention to provide an improved stripwinding control apparatus operative to control the tension of a striprelative to a winding reel that is operative with said strip and toprovide any desired changes in the strip tension as a function of thebuildup or effective diameter of the strip on the winding reel.

It is another object of the present invention to provide an improvedcontrol apparatus for a strip winding reel or device, wherein thetension of the strip relative to the winding device is varied in apredetermined manner as a function of the operating speed of the Windingdevice and/ or the movement speed of the strip.

It is a different object of the present invention to provide improvedapparatus for controlling the operation of a strip winding reel, whereinthe strip tension relative to the winding reel is varied as apredetermined function of the operating speed of the winding reel and/ora predetermined function of the movement speed of the strip relative tothe winding reel.

It is an additional object of the present invention to provide animproved control apparatus for a strip winding or coiling device,wherein the tension of the strip relative to said device is tapered orvaried in a predetermined manner and in accordance with a predeterminedfunction of the operating speed of said winding device and/ or themovement speed of said strip relative to said device.

It is still another object of the present invention to provide improvedcontrol apparatus for a strip coil winding device, which apparatus isoperative to vary the tension of the strip relative to the windingdevice to provide a predetermined percentage change in the regulatedstrip tension relative to the Winding device as a function of the stripbuild-up or eifective diameter on the winding device.

These and other objects and advantages of the present invention willbecome apparent in view of the following desription taken in conjunctionwith the drawings, wherem:

FIGURE 1 is a schematic showing of control apparatus in accordance withthe present invention;

FIG. 2 is a curve chart illustrating the operation of the presentcontrol apparatus; and

FIG. 3 shows a schematic for the regulated D.C. voltage source shown inFIGURE 1.

In FIG. 1 there is shown a strip of material movable from an entry reel12 through a strip tension controlling device 14 and a strip coating ortreating device 16, and through a first pair of strip speed controllingbridle rolls 18 and a second pair of speed controlling bridle rolls 20between which a loop is provided in the strip, and finally the strip issupplied to a windup or delivery reel 22. A control motor 24 isoperatively connected for controlling the operating speed of thedelivery reel 22. A first pilot generator 26 is operatively connected tothe delivery reel 22 and provides an output control signal Patented June20, 1961 having a value proportional to the operating speed of thedelivery reel 22. A second pilot generator 28 is operatively connectedto one pair of bridle rollers 18 for providing a control signal having avalue proportional to the operating speed of the bridle rollers 18which, in turn, is proportional to the movement speed of the strip 10. Afirst fixed impedance member 30 and a first ad justable impedance member32 are serially connected relative to the pilot generator 26. A secondfixed impedance member 34 and a second adjustable impedance member 36are serially connected relative to the pilot generator 28. Theadjustable impedance member 32 is provided with a contact arm 38 whichis connected through an impedance member 40 and a first pattern controlwinding 42 of a magnetic amplifier control device 44 to the adjustablecontact arm 46 of the second adjustable impedance member 36.

The magnetic amplifier device 44 is provided with a bias winding 48connected between suitable regulated constant potential direct currentsupply terminals 50 and 52. A well-known IR compensating winding 54 isconnected across an impedance member 56 connected in the armaturecircuit of the winding reel motor 24. A voltage control winding 58 isconnected to be excited in accordance with the voltage applied acrossthe armature of the reel motor 24. The output or load windings 60 and 62of the magnetic amplifier control device 44 are connected throughsuitable rectifier devices and a conventional bridge circuit 64 acrossan alternating current voltage supply 65 such that the field winding 66of the reel motor 24 is energized by the output of the load windings 60and 62.

The contact arms 38 and 46 are commonly connected to be adjusted inposition by a strip tension control member 68, which is adjustable inposition to provide an adjustable or tapered strip tension between 0 and50% as may be desired and as will be later described. In this regard,other suitable percentages of tension adjustment may be accomplishedwith the subject control apparatus as will be readily apparent topersons skilled in this art.

The curve chart shown in FIG. 2 illustrates the taper tension controlavailable with the adjustable impedance members 32 and 36 and thedegrees of tension taper that can be obtained by the adjustment of theseimpedance members. The initial tension value or percent of rated tensioncan be set by adjusting the tension adjustment rheostat 70 within thedirect current voltage source 71 shown in FIG. 3. p

The curve 72 illustrates the operation of the winding or delivery reel22 with 100% initial tension and a 0% taper or variation of saidtension. The curve 74 illustrates the operation of the delivery reel 22for 100% initial strip tension and 25% taper or variation in said striptension. The curve 76 illustrates the operation of the delivery reel 22for 100% initial strip tension and 50% taper or variation in saidtension. The curve 78 illustrates the operation of the delivery reel 22for 50% initial strip tension and 0% taper or variation in said striptension, and the curve 80 illustrates the operation of the delivery reel22 for 50% initial strip tension and 50% taper or variation in saidstrip tension.

In FIG. 3 there is shown a circuit schematic for the well-knownregulated direct current voltage source 71 shown in FIG. 1. It isoperative as a constant current device with the generator having itsfield winding 102 controlled by the output from the load windings 104and 106 of a magnetic amplifier device 108, having a motor armaturecurrent responsive winding 110, and a pattern winding 112 connectedthrough a strip tension adjustment member 70 between a pair of directcurrent voltage supply terminals 114 and 116. r

In the operation of the control apparatus shown in FIG. 1, the desiredtaper or variation of the strip tension relative to the winding ordelivery reel 22 is provided to give an adjustable percentage decreaseor change in the regulated strip tension imposed on the strip by thedelivery reel 22 as the strip coil builds up to a maximum outsidediameter. The initial value of strip tension imposed on the first fewwraps of the strip coil on the delivery reel 22 can be adjusted by theadjustable impedance member 70 in accordance with a predetermineddesired value, such as, for example only and not limitation, 100% forthe curves 72, 74 and 76 as shown in FIG. 2 and 50% in accordance withthe curves 78 and 80 as shown in FIG. 2. By suitable adjustment of thetaper control member 68, the percentage of taper or variation in theregulated value of strip tension by which the initial strip tension asdetermined by the setting of the im pedance member 70 is reduced whenthe strip coil reaches its maximum outside diameter is controlled byvarying the position of the contact arm 38 on the impedance member 32and the contact arm 46 on the impedance member 36. In this regard, theamount of taper or variation in the strip tension relative to thedelivery reel 22 can be adjusted to any value between zero for which thestrip r tension would remain approximately constant throughout the coilbuild-up and 50% for which the strip tension at maximum build-up wouldbe in the order of one-half the initial strip tension.

In this regard, greater amounts of taper or variation of the striptension, for example, 75% may be provided by suitably determining thevalue of the impedance member 32 relative to the impedance member 30 andthe impedance member 36 relative to the impedance member 34 as will belater explained.

The strip tension is regulated by regulating the input power to the reelmotor 24 to be proportional to the strip speed and the value of thedesired strip tension.

Since the various mechanical electrical winding and transmission lossesof the motor, gearing and reel are not constant as the speed changes,some variation in strip tension will result as the coil builds up and asthe strip speed is varied. However, these normally are small inmagnitude because the change in strip tension is only a part of thetotal drive losses.

The taper or reduction in the strip tension as a function of the stripcoil build-up on the delivery reel 22 is effected by the subject controlapparatus by decreasing the counter electromotive force voltage of thereel motor 24 as the coil builds up. This is regulated by the motorfield regulator which regulates the counter to be proportional to thestrip speed minus the desired taper or variation in the strip tension.

The subject control apparatus automatically reduces the strip tensionrelative to the delivery reel 22. As the strip coil builds up on thedelivery reel 22, the amount of reduction or taper in the strip tensionfrom the start of the coil on the empty delivery reel 22 until the stripcoil reaches its maximum rated diameter on the delivery reel 22 isadjustable by the tension control arm 68. The curve chart shown in FIG.2 is illustrative of the operation with a delivery reel 22 having anempty delivery reel diameter in the order of 16 inches and a maximumrated strip coil build-up diameter in the order of 54 inches. Further,the curves 76 and 80 are illustrative of a reduction in strip tension inthe order of 50% relative to the initial tension; however, lesser orgreater percentages may be readily effected by the control apparatus inaccordance with the present invention and as shown in FIG. 1.

In the operation of the control apparatus as shown in FIG. 1, power issupplied to the winding reel motor 24 from a suitable voltage source 71,including an adjustable impedance member 70 as shown in FIG. 3, suchthat the voltage supplied to the reel motor 24 is that necessary tocirculate a regulated and adjustable amount of current through thearmature of the reel motor 24. The quantity of current sent through thearmature of the reel motor 24 is set by the adjustable impedance member70 to be proportional to the value of an initial strip tension desired,that is the tension for the first few wraps on the delivery reel 22.With the taper tension rheostat members 32 and 36 set for 0% taper bythe tension control member 68, the strip tension will be heldsubstantially constant throughout the strip coil build-up with thecurrent regulator on the power supply and a motor counter regulatorcontrolling the winding reel motor field. In this regard, the patternfield 42 of the counter E.M.F. regulating magnetic amplifier controldevice 44 is excited directly across the bridle pilot generator 28, theoutput of which is proportional to strip speed. The voltage controlwinding 58 is excited from the reel motor armature circuit, and the IRwinding 54 is excited proportional to the armature current of the reelmotor 24, with the relative strength of the latter two fields beingadjusted such that in combination they supply ampere turns proportionalto the reel motor counter Self-energizing and anti-hunt windings havenot been provided on the magnetic amplifier control device 44; however,they may be included in the manner well-known to persons skilled in thisparticular art.

The adjustable impedance member 73 is initially adjusted to supplyminimum excitation to the field winding 66 of the reel motor 24, and theoutput rectifiers in series with the respective load windings 60 and 62of the magnetic amplifier control device 44 are connected such that theyoperate to increase the excitation of the field winding 66.

With the taper tension adjusting control arm 68 set for 50% taper, thepattern field 42 is excited from a portion of the output voltage of thebridle pilot generator 28 and a portion of the output voltage from thereel pilot generator 26. The reel pilot generator is driven directlyfrom the delivery reel 22 such that it provides a voltage outputproportional to the operating speed of the delivery reel 22. Similarly,the pilot generator 28 is operative with the bridle rollers 18 toprovide an output voltage proportional to the operating speed of thebridle rollers 18 and thereby the movement speed of the strip 10. The respective output voltages of the pilot generators 26 and 28 should beinitially adjusted such that they are equal at rated line feet perminute and with the delivery reel 22 turning at a speed so that itsmandrel peripheral velocity is substantially equal to said line speed.The impedance members 30 and 34 and the potentiometers 32 and 36 must beso selected that the excitation supplied to the pattern winding 42 atthe start of the coil build-up is the same as if the taper tensionrheostat had been set at zero, and must further be such that when thecoil reaches its maximum diameter, the excitation has been reduced inaccordance with the setting of the taper tension control member 68.

Assuming the value of the impedance member 40 in series with the patternwinding 42 to be greater than the values of the impedance members 30 and34 and the potentiometers 32 and 36, then the following formulasillustrate the manner of determining the value of the impedance members30 and 34 and potentiometers 32 and 36. If E equals the voltage of thebridle pilot generator 28 at full speed and the output voltage of thereel pilot generator 26 at empty delivery reel speed, and the constant Kis the ratio of the maximum coil diameter to the minimum coil diameteror the external diameter of the delivery reel 22, when the taper controlmember 68 is set at 50% tension taper and at the start of the coil, thefollowing relationship is true:

l EE sz'l' 30 ET aa-iu At maximum coil diameter the followingrelationship is. true: 1

E 32 E 34 2 32 E 1 30 E 2 avi- 30 Kl avi- 34 2 ari- 30 KI and- 34 If wesubtract Equation 2 from Equation 1 and reorganize the following istrue:

Further, it can be shown that the quantity (speed) tension One H.P.--EI-746 watts For a 100 lb. initial tension, and 50% taper application,with amps as regulated by the voltage source 71, in accordance withdesired initial tension, and a speed of 330- ft./mm.

for minimum coil diameter.

1 H.P.=(1O amps) 74.6 volts At maximum coil diameter Thus, the reductionin strip tension is accomplished by a reduction in the voltage appliedto the reel motor 24.

Although the present invention has been described with a certain degreeof particularity, it should be understood that the present disclosurehas been made only by way of example and that numerous changes in thedetails of construction and the combination and arrangement of parts maybe resorted to without departing from the scope and the spirit of thepresent invention.

I claim as my invention:

1. In control apparatus for a strip winding reel operative with a movingstrip of material, said reel being operative with a motor forcontrolling the operating speed of the winding reel, the combination ofa first speed sensing device for providing a first control signal thatvaries as a function of the operating speed of said winding reel, asecond speed sensing device for providing a second control signal thatvaries as a function of the movement speed of said strip, a motorcontrol device responsive to said first and second control signals andoperative with said motor, with said motor control device including apredetermined strip parameter adjusting device operatively connected toeach of said first and second sensing devices to adjust the response ofsaid motor control device to each of said first and second controlsignals respectively in accordance with a predetermined percentage ofeach of said first and second control signals.

2. In adjustable strip tension control apparatus for a strip windingreel operative with a moving strip of material, said reel beingoperative with a motor for controlling the operative speed of saidwinding reel, the combination of a first speed sensing device operativewith said winding reel for providing a first control signal having avalue that varies in accordance with the operative speed of said windingreel, a second speed sensing device operative with said strip forproviding a second control sig- H.P.= =0.5 H.P.=(l0 amps) (37.3 volts)nal having a value that varies in accordance with the movement speed ofsaid strip, a motor control device responsive to said first and secondcontrol signals for controlling the operative speed of said winding reelin accordance with the value of said first and second control signals,and a strip tension adjustment device operative with each of said firstand second speed sensing devices for adjusting to a predeterminedpercentage the value of each of said first and second control signalsfor providing a predetermined adjustment in the tension of said strip.

3. In tension control apparatus for a strip winding device operativewith a moving strip of material, with said winding device including amotor for controlling the operative speed of said winding device, thecombination of a first speed sensing device operative with said windingdevice for providing a first control signal that varies as a function ofthe operating speed of said winding device, a second speed sensingdevice operative with said strip for providing a second control signalthat varies as a function of the movement speed of said strip, a striptension control circuit including a first adjustable control memberoperative with said first speed sensing device for adjusting the valueof said first control signal and a second adjustable control memberoperative with said second speed sensing device for adjusting the valueof said second control signal, a motor control device operative withsaid motor and responsive to the adjusted value of each of said firstand second control signals for controlling the operation of said windingdevice in accordance with a predetermined percentage of each of saidfirst and second control signals as determined by the adjustment of saidrespective first and second adjustable control members.

4. In strip tension control apparatus for a strip winding reel operativewith a moving strip of material, said reel being operative with a motorfor controlling the operational speed of the winding reel, thecombination of a first speed sensing device operative with said windingreel for providing a first control signal that varies as a function ofthe Operating speed of said winding reel, a second speed sensing deviceoperative with said strip for providing a second control signal thatvaries as a function of the movement speed of said strip, a pair ofseries connected impedance devices each having an adjustable contactarm, with one of said impedance devices being connected in series withsaid first speed sensing device and the other of said impedance devicesbeing connected in series with said second speed sensing device andbeing operative to provide between said respective contact arms a thirdcontrol signal, with said respective contact arms being adjustable toprovide between said contact arms said third control signal inaccordance with a predetermined desired strip tension pattern, and amotor control device operatively connected to said contact arms forresponding to said third control signal for controlling the tension ofsaid strip relative to said strip winding reel in accordance with saidpredetermined desired strip tension pattern.

5. In strip tension control apparatus for a winding reel operative witha moving strip of material, with said reel being operative with a motorfor controlling the operation of said Winding reel, the combination of afirst control signal source operative with said winding reel forproviding a first control signal that has a voltage value proportionalto the speed of said reel, a second control signal source operative withsaid strip for providing a second control signal that has a voltagevalue proportional to the speed of said strip, a control circuitincluding a first impedance member responsive to said first controlsignal and a second impedance member responsive to said second controlsignal, with said first impedance member having a first adjustableoutput connection and with said second impedance member having a secondadjustable output connection for providing between said first and secondoutput connections a third control signal having a value correspondingto a predetermined relationship between said 7 first and second controlsignals, and a motor control device operatively connected to each ofsaid output connections for controlling the operation of said windingreel and thereby the tension of said strip relative to said winding reelin accordance with the value of said third control signal.

6. In control apparatus for a strip winding reel operative with a movingstrip of material, with said winding reel being operative with a motorfor controlling the operation of said winding reel relative to saidstrip, the combination of a first speed sensing device operative withsaid winding reel for providing a first control signal that varies as afunction of the operating speed of said winding reel, a second speedsensing device operative with said strip for providing a second controlsignal that varies as a function of the movement speed of said strip,and a strip control device operative with said motor and including afirst adjustable control member operative with said first speed sensingdevice for adjusting the value of said first control signal and a secondadjustable control member operative with said second sensing device foradjusting the value of said second control signal, with said stripcontrol device being operative to control the operation of said windingreel relative to said strip in accordance with a predeterminedcombination of said first control signal and said second control signal.

7. In control apparatus for a strip winding reel operative with a movingstrip of material, with said winding reel being operative with a motorfor controlling the operating speed of said winding reel, thecombination of a first speed sensing device operative with said winding.

reel for providing a first control signal that varies as a function ofthe operating speed of said winding reel, a second speed sensing deviceoperative with said strip for providing a second control signal thatvaries as a function of the movement speed of said strip, and a striptension control device operative with Said motor and including a firstadjustable control member operative with said first speed sensing devicefor adjusting the value of said first control signal and a secondadjustable control member operative with said second speed sensingdevice for adjusting the value of said second control signal, with saidstrip tension control device being operative to control the operativespeed of said winding reel in accordance with the sum of a predeterminedportion of said first control signal and a predetermined portion of saidsecond control signal.

8. In a strip control apparatus for a strip winding reel operative witha moving strip of material, said reel being operative with a motor forcontrolling the tension of said strip relative to said reel bycontrolling the operational speed of the winding reel, the combinationof a first speed sensing device operative with said winding reel forproviding a first control signal that varies as a function of theoperating speed of said winding reel, a second speed sensing deviceoperative with said strip for providing a second control signal thatvaries as a function of the movement speed of said strip, and a motorcontrol device for said motor and including a pair of series connectedimpedance devices each having an adjustable contact arm, with one ofsaid impedance devices being connected in series with said first speedsensing device and the other of said impedance devices being connectedin series with said second speed sensing device, with said contact armsbeing adjustable to provide between said contact arms a third controlsignal in accordance with a predetermined desired strip tension pattern,with said motor control device being operative to reduce the value ofsaid third control signal and thereby control the speed of said windingreel as a predetermined inverse function of the diameter of strip woundon said winding reel.

References Cited in the file of this patent UNITED STATES PATENTS2,601,957 Halter July 1, 1952 2,665,401 Pell Jan. 5, 1954 2,765,989 PellOct. 9, 1956

